Back-rest



AND W. GERSTENMAIER.

BACK BEST.

APPLICATION FILED AUG-Ih19l8 1 09,725. Patented July 15, 1919.

air .A 7-21 6 CARL GERSTENMAIER AND WALTER GERSTENMAIER, OF ST. PAUL, MINNESOTA.

BACK-REST.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed August 17, 1918 Serial No. 250,411.

To all whom it may concern:

Be it known that we, CARL GERSTENMAIER and VALTER GERSTENMAIER, citizens of the United States, residing at St; Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvementsuin Back-Rests, of which the following is a specification.

This invention relates to improvements in detachable back rests designed for use on farming implements and the like which have concaved backless seats formed to fit the bod of the occupant.

An object of the invention is to provide an improved device readily attachable to seats of varying sizes, the attaching means consisting wholly of a system of edge engaging and form embracing wires joined together to eontactingly encircle and grip the seat. The invention consists in the con struction, combination and arrangement of parts hereinafter described in the specification, reference being had to the drawings which form a part thereof.

Figure 1 is a perspective view of the invention applied to a seat the latter being shown in dotted lines.

Fig. 2 is a plan view of the bottom of the seat with the invention attached, the latter being partly broken away and Fig. 3 is a vertical section through the rolled edge of the seat showing one of the hooks in engagement therewith.

Referring to the drawings, A is a seat of the type usually used on farming implements requiring an attendant to be carried on the frame. The seat represented in broken lines in Fig. 1, is formed with a deep concavity B adapted toreceive the buttocks and thigh of the occupant the concavity being divided centrally by a more or less prominent pommel C at its forward edge. The edge D formed with a semicircular roll opening downward. (Fig. 3) bounds the concavity, substantially in a horizontal plane, on the rear and sides and slants downwardly and inwardly at the front to form thigh supports E on either side of the pommel.

Feats of this t '])e are nsuallv supported on the frame of t 1e implement liy means of a. bar F suitably bolted through the central colt hole G. However, no uniformity with respect to the shape of the bar F exists among the various makes of implements,

uniformityexisting only at the point of attachment to the seat.

The invention comprises a back support member, an ed e gripping member and an adjustable locklng device.

The back support which is sli htly rearwardly inclined from the verticaTis located at the back of the seat and comprises outer arms 2, joined together at the top and interwound with a central brace 3. The arms and brace are firmly supported on the edge gripping member, which latter comprises a bar 4 overlying the rolled edge of the seat and following in form the linear curvature thereof to the front of the seat along both sides thereof at which point the bar is formed with a return bend to form indents or hooks 5 adapted to receive the downturned edges of the thigh supports E. From the indents the bar is bent inwardly one end thereof terminating in an eye to which is attached one end of the coil spring 6, the other end thereof having link attachment with a curved hook 7 The bar 4 continues rearwardly and is bent. to form a. cross tie member which comprises a curved tie bar 8 bent to conform to the convex outer surface of the bottom of the seat A and extends to the rear thereof, where it is bent to form an indent 9 adapted to receive the downturned edge of the rolled edge D. From the indent 9 the tie bar is bent centerward with respect to the seat and is secured to the center brace 3. A pair of hooks 10, one at either side of the seat and on the bar 4, and located at a point somewhat forward of the center of the sides are adapted to engage the downturncd edge of the roll D.

A link chain 11, secured at one end on the tie bar 8, is adapted to engage with any desired link the hook 7. whereby the forward arts of the edge gripping member are oined together, the tension in the spring 6 pulling the indents 5 and 9 and the hooks 1O firmly over the downturned edge of the rolled edge D. The chain 11 and the hook 7 may be said to constitute adjustable looking means rendering the invention attachable to seats varying in width. It will he noted that the indent 9 holds the back mom ber against forward movement over the seat i. ll 5 and that the chain 11 may cross either above or below the bar F depending upon the design of the bar.

\Ve claim:

1. In a device of the class described in combination with a seat having a surround ing downturned edge, of a back member in connection with a bar overlying and engaging said downturned edge at the front and rear thereof to hold it located thereon and means in connection with said bar to hold it in locked engagement with said downturned edge.

2. In a device of the class described in combination with the sides and back of a seat having a surrounding edge, of a back member in connection with a bar overlying and engaging said downturned edge to hold it located thereon and extending at each side to and beneath the front of said seat and adjustable locking means connecting opposite sides of said bar beneath said seat for the purpose set forth.

In a device of the class described in combination with a concaved seat having a surrounding downturned edge, of a back member supported on a bar overlying and engaging said downturned edge to be held positioned thereon and extending along the sides to and beneath the front of said seat and a tie member between said bar and bark member and engaging the convex bottom of said seat for the purpose set forth.

4. In a device of the class described in combination with aconeaved seat having a surrounding downturned edge, of .a back member supported on a bar bent to conform to the linear curvature of said downturned edge and having hooks and indents to receive said downturned edge to hold it positioned thereon said bar extending along the sides to and beneath the forward edge of said seat, and locking means in connection with said bar to constantly tend to pull opposite sides of said bar toward each other to grip said sent between them.

In testimony whereof we aflix our signaturcs in presence of two witnesses.

()ARL GERPTENMAIER. WALTER GERSTENMAIER.

\Vitnesses Gnoncn VOELKER, \VILLIAM T. GODDARD. 

